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  1. #1
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    Free horespower?

    Thread found at Dodge Dart Central, referring to the engine shared with the Abarth:

    Remove the cover off the engine and take a look at the charge pipe on the Driver's side. You should see the MAF sensor and the 3/8" vacuum line just prior to it. If you follow this line you will see that it goes to a Tee. One side goes to the intake manifold (I believe) and the other goes to the intake just prior to the turbo. There is NO check valve which means that this a direct boost leak. This is the reason for laggy boost and boost dropping off on the top end. I removed the hose on the charge pipe (driver's side). I place a rubber/plastic cap on the tube then placed the hose back on it. This effectively blocked off the flow. Now I have more TQ down low with a quicker spool and more HP up top with no boost leaks. The car is enjoyably to drive.
    There's some discussion about design vs. assembly defect, and some mixed responses about what the Abarth has (one said the Abarth has a checkvalve, the other said it did not). Like so much pertaining to Chrysler, it appears YMMV.

    Anyway, I'm crossposting here in case someone cares to explore and experiment.

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    Quote Originally Posted by sportbiker View Post
    Thread found at Dodge Dart Central, referring to the engine shared with the Abarth:



    There's some discussion about design vs. assembly defect, and some mixed responses about what the Abarth has (one said the Abarth has a checkvalve, the other said it did not). Like so much pertaining to Chrysler, it appears YMMV.

    Anyway, I'm crossposting here in case someone cares to explore and experiment.
    Ha! My usual screen name is Blitzkrieg. I posted my findings on the Dart forums. The Abarth has the same issue as the Dart. There is not a check valve in the Abarth. We tried this fix on the Abarth, but the jury is still out on the verdict. We are going to do some datalogs before and after to prove the benefit.
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    I see I'm not the only one who haunts both boards! Glad to know there's a cross-current.

    It'll be interesting to learn your results.

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    Quote Originally Posted by sportbiker View Post
    Thread found at Dodge Dart Central, referring to the engine shared with the Abarth:



    There's some discussion about design vs. assembly defect, and some mixed responses about what the Abarth has (one said the Abarth has a checkvalve, the other said it did not). Like so much pertaining to Chrysler, it appears YMMV.

    Anyway, I'm crossposting here in case someone cares to explore and experiment.

    Good find!

    I just tested this on the dyno while I had my car on there. 2 pulls with the suspect hose connected to the intake pipe and then 2 pulls with the same hose plugged off and sealed. On my car, it didn't affect spool but held more boost up top. See the attached snapshot. I also noticed this hose was leaking when i did a boost leak test a couple of weeks ago. Will leave it plugged for now but I need to trace it back to the tee to see what its function is first before disabling it entirely.
    Attached Images Attached Images

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    Quote Originally Posted by twingtx View Post
    Good find!

    I just tested this on the dyno while I had my car on there. 2 pulls with the suspect hose connected to the intake pipe and then 2 pulls with the same hose plugged off and sealed. On my car, it didn't affect spool but held more boost up top. See the attached snapshot. I also noticed this hose was leaking when i did a boost leak test a couple of weeks ago. Will leave it plugged for now but I need to trace it back to the tee to see what its function is first before disabling it entirely.
    I traced the whole system. It is part of the EVAP system. It ties to the fuel tank charcoal canister and intake manifold. BTW the intake manifold has a check valve. I wouldn't disconnect it if you can place a check valve on it.
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    Quote Originally Posted by Wego Faster @ Tifosi View Post
    I traced the whole system. It is part of the EVAP system. It ties to the fuel tank charcoal canister and intake manifold. BTW the intake manifold has a check valve. I wouldn't disconnect it if you can place a check valve on it.
    Good call. I'll just add a 2nd check valve right between the fitting and the intake pipe. That'll get rid of that leak. Then, let's hope it's not also sending boost into the Evap hose leading to the fuel tank.

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    Quote Originally Posted by twingtx View Post
    Good call. I'll just add a 2nd check valve right between the fitting and the intake pipe. That'll get rid of that leak. Then, let's hope it's not also sending boost into the Evap hose leading to the fuel tank.
    There is a solenoid prior to the EVAP line, but I am not sure when it is open or closed. May be possible.
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    Quote Originally Posted by Wego Faster @ Tifosi View Post
    I traced the whole system. It is part of the EVAP system. It ties to the fuel tank charcoal canister and intake manifold. BTW the intake manifold has a check valve. I wouldn't disconnect it if you can place a check valve on it.
    That portion of the EVAP system seems to be causing me grief too, my MM boost controller doesn't seem to work consistently due to a potential leak, and I'm wondering if that's where it's coming from.

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    Which fitting are we talking about here?

    And where exactly would you place the check valve?

    In the stock system, is the check valve located in the hard intake line between the airbox and the turbo inlet?

    Thanks,

    Tony

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    Every once in a while i'm popping a code P0299 "Underboost condition" Could this be related to this leak?

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